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Commit 6bf86159 authored by Max Kazantsev's avatar Max Kazantsev
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[LoopSimplifyCFG] Pay respect to LCSSA when removing dead blocks 

Utility function that we use for blocks deletion always unconditionally removes
one-input Phis. In LoopSimplifyCFG, it can lead to breach of LCSSA form.
This patch alters this function to keep them if needed.

Differential Revision: https://reviews.llvm.org/D57231
Reviewed By: fedor.sergeev

llvm-svn: 353803
parent 4390c721
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